1.卸载之前的版本
npm uninstall -g @angular/cli
2.检查是否卸载干净,输入命令
ng version
若显示 command not found: ng 则卸载干净
3.安装指定版本
npm install -g @angular/cli@8.0.6
5.检查版本号
ng version
_ _ ____ _ ___
/ \ _ __ __ _ _ _| | __ _ _ __ / ___| | |_ _|
/ △ \ | '_ \ / _` | | | | |/ _` | '__| | | | | | |
/ ___ \| | | | (_| | |_| | | (_| | | | |___| |___ | |
/_/ \_\_| |_|\__, |\__,_|_|\__,_|_| \____|_____|___|
|___/
Angular CLI: 9.1.12
Node: 14.5.0
OS: darwin x64
Angular: 9.1.12
... animations, cli, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router
Ivy Workspace: Yes
Package Version
-----------------------------------------------------------
@angular-devkit/architect 0.901.12
@angular-devkit/build-angular 0.901.12
@angular-devkit/build-optimizer 0.901.12
@angular-devkit/build-webpack 0.901.12
@angular-devkit/core 9.1.12
@angular-devkit/schematics 9.1.12
@ngtools/webpack 9.1.12
@schematics/angular 9.1.12
@schematics/update 0.901.12
rxjs 6.5.5
typescript 3.8.3
webpack 4.42.0
显示这些信息,恭喜你,表示你已经安装成功;
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